1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
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  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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  23 
  24 /**
  25  * @test TestTenuredGenPoolCollectionUsage
  26  * @bug 8175375
  27  * @requires vm.gc.G1 
  28  * @summary Verify that MemoryPoolMXBean.getCollectionUsage() works fine with
  29  * -XX:+UseG1GC and -XX:+ExplicitGCInvokesConcurrent
  30  * @library /test/lib /
  31  * @modules java.base/jdk.internal.misc
  32  * @modules java.management/sun.management
  33  * @run main/othervm -XX:+ExplicitGCInvokesConcurrent -XX:+UseG1GC
  34  * TestTenuredGenPoolCollectionUsage
  35  */
  36 
  37 import java.util.ArrayList;
  38 import java.util.List;
  39 import java.lang.management.ManagementFactory;
  40 import java.lang.management.MemoryPoolMXBean;
  41 import java.lang.management.MemoryType;
  42 import jdk.test.lib.Asserts;
  43 
  44 public class TestTenuredGenPoolCollectionUsage {
  45 
  46     public static void main(String[] args) {
  47         new TestTenuredGenPoolCollectionUsage().test();
  48     }
  49 
  50     private final void test() {
  51         MemoryPoolMXBean tenuredGenPool = null;
  52         List<byte[]> data = new ArrayList<>();
  53         for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) {
  54             if (pool.getType() == MemoryType.HEAP && pool.isUsageThresholdSupported()) {
  55                 tenuredGenPool = pool;
  56             }
  57         }
  58         data.add(new byte[1024 * 1024 * 50]);
  59         try {
  60             Thread.sleep(100);
  61         } catch(InterruptedException ie) {
  62             ie.printStackTrace();
  63         }
  64         System.gc();
  65         System.out.println("Collection usage = " + tenuredGenPool.getCollectionUsage().getUsed() + ", usage = " + tenuredGenPool.getUsage().getUsed());
  66         Asserts.assertTrue(tenuredGenPool.getCollectionUsage().getUsed() > 0);
  67     }
  68 }